%0 Journal Article %1 Shi2001 %A Shi, Lei %A Li, Chen %A Dong, Qiuzhao %A Zhang, Yuheng %D 2001 %J Journal of Physics: Condensed Matter %K imported %N 22 %P 5195 %R 10.1088/0953-8984/13/22/313 %T Charge-transfer induced by Pb-doping and annealing in Bi-2212 phase superconductor %U http://stacks.iop.org/0953-8984/13/i=22/a=313 %V 13 %X A systematic study of Pb-doping and annealing effects in vacuum (2×10 -3 Pa) on T c and the microstructure of Bi 2- x Pb x Sr 2 CaCu 2 O δ compounds has been carried out. It is found that the structure belongs to the Bi-2212 phase. The c - and b -axes almost keep unchanged while Bi is replaced by Pb. With increasing annealing temperature, c - and b -axis parameters monotonically increase while the a -axis parameter is unchanged. The modulated period becomes longer and finally disappears with increasing Pb content and annealing temperature. Meanwhile, the distortion of CuO 2 planes becomes serious. There is an optimum T c with increasing annealing temperature, which reveals that the carrier concentration p changes from overdoped to underdoped. It is suggested that the differences of both the valences and the ionic sizes of Pb 2+ and Bi 3+ cause the reduction of extra oxygen, resulting in the increasing positive charge in the BiO double planes. The distortion of CuO 2 planes is partially caused by the increase of positive charge in BiO double planes. A charge-transfer between the carrier reservoir (BiO-SrO) and the conducting CuO 2 plane is induced by Pb-doping and annealing in vacuum. Both the distortion of CuO 2 planes and the charge-transfer control the carrier concentration and carrier distribution in CuO 2 planes, which is related to the superconductivity of the Pb-doped Bi-2212 phase.

@article{Shi2001, abstract = {A systematic study of Pb-doping and annealing effects in vacuum (2×10 -3 Pa) on T c and the microstructure of Bi 2- x Pb x Sr 2 CaCu 2 O δ compounds has been carried out. It is found that the structure belongs to the Bi-2212 phase. The c - and b -axes almost keep unchanged while Bi is replaced by Pb. With increasing annealing temperature, c - and b -axis parameters monotonically increase while the a -axis parameter is unchanged. The modulated period becomes longer and finally disappears with increasing Pb content and annealing temperature. Meanwhile, the distortion of CuO 2 planes becomes serious. There is an optimum T c with increasing annealing temperature, which reveals that the carrier concentration p changes from overdoped to underdoped. It is suggested that the differences of both the valences and the ionic sizes of Pb 2+ and Bi 3+ cause the reduction of extra oxygen, resulting in the increasing positive charge in the BiO double planes. The distortion of CuO 2 planes is partially caused by the increase of positive charge in BiO double planes. A charge-transfer between the carrier reservoir (BiO-SrO) and the conducting CuO 2 plane is induced by Pb-doping and annealing in vacuum. Both the distortion of CuO 2 planes and the charge-transfer control the carrier concentration and carrier distribution in CuO 2 planes, which is related to the superconductivity of the Pb-doped Bi-2212 phase.}, added-at = {2010-11-06T00:14:39.000+0100}, author = {Shi, Lei and Li, Chen and Dong, Qiuzhao and Zhang, Yuheng}, biburl = {https://www.bibsonomy.org/bibtex/2e8fe5a8df0785a6ea8ac519b2365e2f4/nplumb}, doi = {10.1088/0953-8984/13/22/313}, file = {:C\:\\Users\\Nick\\Documents\\Papers\\Shi et al. - Charge transfer induced by Pb-doping and anneling in Bi-2212 phase superconductor.pdf:PDF}, interhash = {5fa1df83c7de20e85ec5495a44f6acea}, intrahash = {e8fe5a8df0785a6ea8ac519b2365e2f4}, journal = {Journal of Physics: Condensed Matter}, keywords = {imported}, number = 22, owner = {Nick}, pages = 5195, timestamp = {2010-11-06T00:14:43.000+0100}, title = {Charge-transfer induced by Pb-doping and annealing in Bi-2212 phase superconductor}, url = {http://stacks.iop.org/0953-8984/13/i=22/a=313}, volume = 13, year = 2001 }